Cutting tool



F. C. WENZEL Feb. 12, 1935.

CUTTING TOOL -Fi led Aug. 30, 1952 INVENTOR M/QQ A TTORNE V Patented Feb. 12, 1935 UNITED STATES CUTTING TOOL Frederick C. Wenzel, Stamford, Conn.

Application August 30,

Claims.

5 knife blade having no traction features.

More especially, it is the object of my invention to devise a cutting tool which will operate to cut smoothly and easily, the overhanging portion of wall paper hung in the usual manner by artisans of that class. In this particular art, the paper is hung in long strips, parts of it overhanging the bottom molding. This paper is soft and soggy, and therefore, does not lend itself readily to cutting by the ordinary cutting knife. My invention comprises more particularly a rotary cutting blade which will travel over paper of this type, and which will supply its own traction, cutting the paper smoothly on the one side thereof while obtaining traction from the other or waste side, on which is impressed a partial tractive perforation.

I shall now refer to the drawing wherein a preferred modification of my invention is illustrated. Fig. 1 is a side view of my cutting tool, while Fig. 2 is a plan view of the same. Fig. 3 is an enlarged view of the cutting teeth while Fig. 4 is a section taken along lines 44 of Fig. 3. Fig. 5 illustrates a portion of a paper or other material cut with my particular tool embedded in the paper up to the position of line 55 of Fig. 4. Fig. 6 illustrates a form of cut made with my blade when it has been inserted up to the section indicated by line 6-6 of Fig. 4.

Referring now more particularly to the drawing, reference numeral 10 indicates a preferred type of handle to which is secured, by any particular means a pair of extension members 11 upon which is mounted the rotary cutting wheel 12. The mounting may be of any particular form desired, and forms no part of the present invention.

As will be observed from Figs. 3 and 4, my cutting blade comprises a series of evenly spaced points 13 formed by bevels 14 on one side of the blade, the blade being so'formed that the points 13 are merely part of the continuous cutting surface embodying the points 13 and the sides 15 of the bevels. On one side 16 of my blade are the bevelled traction ridges, and the cutting edge formed by them, while on the other side 17 of the cutting edge is continuous and lies in one plane.

Figs. 5 and 6 illustrate the manner in which my cutting tool will operate against any particular 5 material to be severed thereby. When the knife 1932, Serial No. 631,024

is embedded initially it will immediately obtain complete traction, and when embedded only up to the position of line 55 of Fig. 4, it will give the perforated cutting action illustrated in Fig. 5 which may be useful for some purposes. When continuous cutting is requiredfthe knife is embedded more deeply, and the cutting blade first produces its own traction as indicated by the cut 18 of Fig. 5, then allows the continuous cutting edge of the side 17 to function so as to give the smooth edge 19 to one side of the paper as illustrated in Fig. 6, while the bevelled portion 14 will cooperate with the scrap side of the paper to give the relatively perforated and rough portion 20, whereby to contribute a tractive function to the knife, while the knife is at the same time functioning to cut smoothly on the important and remaining portion of the paper.

While perforators having side ridges for traction, and rotary perforators are well known in the art, it is thus apparent that my invention contributes to the art a rotary blade having a continuous cutting and tractive operation, while at the same time, and in itself, yielding a smooth and continuous out.

I claim:

A. A hand tool comprisinga rotary cutting blade having a serrated cutting surface with a series of perforating points arranged about its circumference, whereby immediate traction of said tool on the material to be severed is obtained, the portions of the serrated surface between said points being formed for cutting so that said blade will have a continuous cutting surface and will contribute a continuous out if embedded deeply in the material to be severed, one side of said cutter having a flat surface, the other side being formed of ridges leading away from said perforating points.

2. A hand tool comprising a rotary cutting blade having a serrated surface with a series of perforating points about its circumference acting as initial traction elements and forming part of a continuous cutting surface adapted to contribute a continuous out if embedded deeply in the material to be severed, whereby when said blade is applied to material, it will perforate and then out, said perforating points being formed by bevels on one side of said blade, said bevels cooperating with one sideof the cut to contribute traction to said blade while it is cutting.

3. A hand tool comprising a rotary cutting blade having a serrated cutting surface with a series of perforating elements distributed about its periphery, said elements forming part of a continuous cutting surface on a'varying but smaller diameter than said perforating elements, one side of said blade being flat, said perforating and cutting surfaces being formed by bevels on the other side of said blade, whereby said'blade when initially applied to material will have its perforating elements'contribute initial traction, and said fiat side and continuous cutting surfaces will form a smooth out edge on one side of a cut made by the blade', and said bevels form traction elements-on the cut material after said blade has cut through to said continuous cutting edge while said perforated elements contribute traction in' advance of the cutting portion of said blade;v V 4.7 A hand tool comprising a rotary cutting blade having a series of perforating'points arranged diametrically about its circumference, said points forming the peaks of a continuous ser-i rated cutting surface, said blade being flat 'on one sidethereof and having bevelled ridges lead,-

ing from the continuous surface on the other side, i

whereby said blade will first engage and perforate with said points the material to be out, then cut with said continuous surface, and perforate with its bevels on one side of the cut'formed thereby while leaving a smooth surface on the other side of the cut.

5. A hand tool comprising a rotary cutting blade formed with a'serrated cutting edge having a series of symmetrical cutting teethleading to tween said points being formed for cutting so that said blade will have a continuous cutting 7 surface and will contribute a continuous out if embedded deeply in a material to be cut, one side or" saidcutter having a flat surface to contribute a' smooth out, the other side being formed with ridges leading away from said perforating points to contribute traction to said tool as it cuts.

FREDERICK Q ENZEL. 

